Drought analysis in Bedadung Watershed based on a Geographical Information System

Reduced water availability toward water needs is an indicator of the occurrence of a drought. Droughts have received greater attention from the Government of Jember Regency in the form of management directions for drought disaster areas. The location of this research is the Bedadung River Watershed, with 13 rain posts located upstream of the Rowotamtu AWLR Station. Drought analysis used the Palmer Drought Severity Index method in the form of an index that informs the level of drought in an area. The results of the study showed that drought with extreme dry classification occurred from June to October with drought index values ranging from -1.820 (June average) to -14.140 (October average). Patrang, Jelbuk, Arjasa and Panti Sub-Districts are areas that have experienced droughts with a duration of 5 months. The Palmer method meteorological drought index and hydrological drought index (value of AWLR Discharge Standardized Box Cox Transformation (Z)) have a unidirectional relationship and a very significant relationship, with the Pearson correlation coefficient being r = 0.905.